# Service bulletin SF635

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10202737
- Published by NHTSA: 2021\-11\-03
- Manufacturer's number: SF635
- Manufacturer's date: 2021\-10\-14
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

XMC Software Update. Due to a software issue with the Xtra Modular Controller \(XMC\), some body builder\-installed electrical components may not work as intended \(may be intermittent or non\-functioning\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10202737-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10202737-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system

## Vehicles listed

- 2021 to 2022 WESTERN STAR 49X

JSON: [/v1/bulletins/10202737](/v1/bulletins/10202737)

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